YOU SAID:

He is so fat that he can't even fit in a truck

INTO JAPANESE

彼はとても太っているので、トラックにも乗れません

BACK INTO ENGLISH

He's so fat that he can't even get on the truck

INTO JAPANESE

彼はとても太っているので、トラックに乗ることさえできません

BACK INTO ENGLISH

He's so fat that he can't even get on the truck